NEN ISO 21771 : 2007
Current
The latest, up-to-date edition.
GEARS - CYLINDRICAL INVOLUTE GEARS AND GEAR PAIRS - CONCEPTS AND GEOMETRY
12-01-2013
Defines the geometric concepts and parameters for cylindrical gears with involute helicoid tooth flanks. It also covers the concepts and parameters for cylindrical gear pairs with parallel axes and a constant gear ratio, which consist of cylindrical gears according to it.
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